Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus

Detalhes bibliográficos
Autor(a) principal: Martins, José Anceloann Lago Grande
Data de Publicação: 2013
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UFU
Texto Completo: https://repositorio.ufu.br/handle/123456789/14199
Resumo: The photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante.
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spelling Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureusStudy of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureusRevestimento autolimpanteFotocatáliseFotodegradaçãoTiO₂Staphylococcus aureusEscherichia coliSelf-cleaning coatingPhotocatalysisPhotodegradationCNPQ::ENGENHARIAS::ENGENHARIA CIVILThe photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMestre em Engenharia CivilA fotodegradação ou fotocatálise é um processo químico de degradação de matéria através da sua decomposição em outros elementos molecularmente mais simples e inofensivos ao ser humano e ao ambiente. O processo se da quando um semicondutor inorgânico como o TiO₂, é irradiado com luz ultravioleta (comprimento de onda de 320 a 400 nm). A energia absorvida provoca excitação eletrônica, fazendo com que elétrons se desprendam dos orbitais atômicos mais externos do semicondutor. Esses elétrons desprendidos, em contato com a água e com o O2, formam regiões oxidantes e redutoras. Sujidades diversas, orgânicas e inorgânicas, em contato com essas regiões, sofrem degradação eletrônica, dissociando em substancias mais simples e menos ofensivas, como CO2 e H2O. Pesquisadores de diversos países estudam compósitos a base de TiO₂ revestindo superfícies tão diversas quanto rodovias, vidros de janelas e bisturis cirúrgicos. A fotocatálise é um processo bastante interessante, e ambientalmente correto, para inativação de patógenos hospitalares resistentes, como fungos e bactérias, pois dispensa a utilização de antissépticos químicos. Estudou-se neste trabalho, o potencial de fotocatálise de um compósito a base de TiO₂ encapsulado em resina epóxi, na degradação da Staphylococcus aureus e da Escherichia coli, patógenos com alto grau de contaminação hospitalar, com vistas à sua aplicação na construção civil, como revestimento de pisos, paredes, tetos e mobiliários de instalações hospitalares. Os experimentos se deram com a fabricação de pastilhas somente com resina epóxi e pastilhas com o compósito, em diversas concentrações de TiO2 e/ou pó de vidro. As pastilhas foram contaminadas com caldo de bactéria e expostas à luz solar e à luz ambiente (solar indireta e lâmpada fluorescente), por determinados períodos. As pastilhas foram lavadas em solução salina estéril. Parte dessa solução foi transferida para placa contendo Mueller Hinton Agar e encubadas por 48 horas. Após esse tempo foi feita a contagem visual do número de UFCs presentes na placa. Os resultados obtidos, principalmente na luz ambiente, indicam potencial capacidade fotodegradante do compósito.Universidade Federal de UberlândiaBRPrograma de Pós-graduação em Engenharia CivilEngenhariasUFUDias, João Fernandohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780737E3Melo, Geraldo Batista dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4777568Y7Rossignolo, João Adrianohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796386U3Martins, José Anceloann Lago Grande2016-06-22T18:37:27Z2014-06-032016-06-22T18:37:27Z2013-11-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfMARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013.https://repositorio.ufu.br/handle/123456789/14199porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFU2017-06-27T13:53:58Zoai:repositorio.ufu.br:123456789/14199Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2017-06-27T13:53:58Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false
dc.title.none.fl_str_mv Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus
title Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
spellingShingle Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
Martins, José Anceloann Lago Grande
Revestimento autolimpante
Fotocatálise
Fotodegradação
TiO₂
Staphylococcus aureus
Escherichia coli
Self-cleaning coating
Photocatalysis
Photodegradation
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL
title_short Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
title_full Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
title_fullStr Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
title_full_unstemmed Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
title_sort Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
author Martins, José Anceloann Lago Grande
author_facet Martins, José Anceloann Lago Grande
author_role author
dc.contributor.none.fl_str_mv Dias, João Fernando
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780737E3
Melo, Geraldo Batista de
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4777568Y7
Rossignolo, João Adriano
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796386U3
dc.contributor.author.fl_str_mv Martins, José Anceloann Lago Grande
dc.subject.por.fl_str_mv Revestimento autolimpante
Fotocatálise
Fotodegradação
TiO₂
Staphylococcus aureus
Escherichia coli
Self-cleaning coating
Photocatalysis
Photodegradation
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL
topic Revestimento autolimpante
Fotocatálise
Fotodegradação
TiO₂
Staphylococcus aureus
Escherichia coli
Self-cleaning coating
Photocatalysis
Photodegradation
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL
description The photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante.
publishDate 2013
dc.date.none.fl_str_mv 2013-11-04
2014-06-03
2016-06-22T18:37:27Z
2016-06-22T18:37:27Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv MARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013.
https://repositorio.ufu.br/handle/123456789/14199
identifier_str_mv MARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013.
url https://repositorio.ufu.br/handle/123456789/14199
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Engenharia Civil
Engenharias
UFU
publisher.none.fl_str_mv Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Engenharia Civil
Engenharias
UFU
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFU
instname:Universidade Federal de Uberlândia (UFU)
instacron:UFU
instname_str Universidade Federal de Uberlândia (UFU)
instacron_str UFU
institution UFU
reponame_str Repositório Institucional da UFU
collection Repositório Institucional da UFU
repository.name.fl_str_mv Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)
repository.mail.fl_str_mv diinf@dirbi.ufu.br
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